Panthographic engraving-machine.



PATEN'TED AUG. 27, 1907.

,0. KUBHNBR. PANTOGRAPHIC E-NGRAVING MACHINE.

APPLICATION FILED MAY 0,1904.

4 SHEETS-SHEET 1.

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PATENTED-AUG. 27. 1907. C. KUEHNER.

PANTOGRAPHIG ENGRAVIG MACHINE. APPLIUATION FILED un e, 1004.

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No. 864,655, l PATENTBD AUG. 27,1907,

v c. KUBHNER.

PANTQGRAPHIG ENGRAVING MACHINE.

APPLICATION FILED MAY 6.1904.

4 SHEETS-SHEET 3.

SMM/W PATENTED AUG. 27, 190'7.4

l o. KUBHNBR. PANTOGRAPHIG lezNGfRAVINGl MACHINE.

APPLIOATIONFILEI) MAY 6.1904.

4 SHEETS-SHEET 4.

sumaron, v. c.

UNITED OFFICE.

CHART/ES KU'EIINER, OF ORANSTON, RHODE ISLAND, ASSIGNOR, BY MESNE ASSIGNMENTS, TO HERMAN G. IOSSNER, OF CRANSTON, RHODE ISLAND.

PANTOGRAPHIC ENGRAVING-MACHINE.

Specification of Letters Patent.

Patented Aug'. 27, 1907.'

Application filed May 6, 1904. Serial No. 206.721.

To all whom il. may concern:

of the town of Cranston, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Pantograph Engraving Machines; and I do hereby declare that the following is a full., clear, and exact description thereof, reference being had to the accompanying drawings, and to the .letters of reference marked thereon, which forni a part of this specification.

My invention relates to an improvement in pantograph engraving machines.

The object of my invention is to provide a machine of this character in which the pointer or' tracer will loe constantly retained in. contact with the figured surface only of the model, the cutting tool being relatively mounted therewith, whereby its cutting operations will. conform exactly to the movements of the pointer, thus saving that time which has heretofore been lost in machines of this character by reason of the tool traversing surfaces beyond the limits of the work. I have therefore constructed and arranged electrical means to operate on the reversing mechanism so that the niodel or pattern and also the material under operation are at times given but a partial rotation, causing the pointer or tracer to travel over the figured surface of the model from one side or boundary thereof to the other, whereupon the direction of travel or rotation of said model will be automatically changed, the movenieut thereof in either direction being sufficient to cause the tracer to travel across the figured surface only.

The invention consists of other novel features and parts and coinliinatiens of the saine as will be fully described hereinafter and then pointed out in the appended claims.

A practical embodiment of the invention is represented .in tho accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure lwis a top plan view illustrating the operating mechanism and the wiring for the electrical reversing mechanism. Fig. 2-is an end view of the machine illustrating the automatic speed controlling device. Fig. 3-#is a front view of the machine, a portion of which is broken away, illustrating the model and the material operated on, also the longitudinal werk bar on which is mounted both the pointer or tracer and the cutting-tool. Fig. l-is an enlarged view illustrating the reversing mechanism. Fig. 5-is an enlarged side view, partly broken away, showing the universal screw adjustment for setting the pointer and tlie cutting tool.

Fig. (iwis an end view of the saine, also partly broken away, showing the elongated hole to allow for a slight circular adjustment.

Referring to the drawings, at 1 is the bed of the machine whicli is supported from the Hoor or other convenient place on the legs 2. On this bed is mounted the shaft or spindle 3, on one end of which is the face plate 4 to which is secured the pattern block 5 (see Fig. 1.) On the opposite end of this spindle 3 is mounted its driving worm gear 6 and reversing friction collar 7 and spring arm 7a. The power to drive this spindle 3 and the attending mechanism is transmitted by a belt (not shown) through the pulley 8, main shaft 9 and automatic speed regulating disks 10-11-12 and 13 to shaft 14, the operation of which will be here inafter more fully described.

Power is transmitted from shaft 14 to shaft 15 through the sprocket wheels 1G and 17 and the chain 18, and from shaft 15 to shaft 19 through the gears 202l22 23 and 24. The gears 23 and 24 are loosely mounted` on said shaft 19 and are both constantly in mesh with gear 22 by which gear they are driven each in opposite directions. These gears 23 and 24 each have a notched face 25 and 2G respectively which faces serve to engage the clutch 27. This clutch is arranged to slide on a fixed key in said shaft 19 to engage either of the two notched faces 25 and 26 and through this clutch the shaft 19 is turned. The direction of rotation of said shaft is rew versed by throwing the said clutch from one gear over to engage the notched face of the other gear. At 28 is a worm fixed to said shaft 19 by which spindle 3 is driven through the worm wheel (i. At 29 is 4the shifting bar which is held to slide longitudinally in suitable bearings 30-30. On this bar is the depending yoke 31 which engages and actuates the sliding clutch 27. At 32-32 are collars that are fixed to said bar 29 and which are engaged by the spring arm 7u. At 33 is a solenoid electro-magnet the lower end of its core 34 being adapted to engage the dog 35 on the bar 29 and hold it against an cndwise movement. stead of coming directly on the end of the core 34 is taken up by the link 36 which link ispivoted at one end to a bracket 37 fixed to the frame of the machine, and allowing the core a sufficient vertical movement to release the dog 35. At 33-38 are set screws to regulate the throw of the friction collar 7 the amount of friction of said collar being regulated by the adjusting screw 39. At l() is the spindle to the outer end of which is secured chuck 41 which holds the die 42 to be cut. This spindie is driven from the model spindle 3 through the two pair of niiter gears 43 and 44. l

Opposite the pattern 5, and die or the piece of material to be operated upon 42, and extending longitudi- The strain of holding this bar in l nally along the machine, is placed a bar or arm 45. On this bar is secured the pointer or tracerl 4G the end of which is kept in constant contact with the model 5 as it revolves or reciprocates. At 47 is the rapidly revolving cutting tool which comes opposite to and operates on the face of said die 42. This cutting tool is revolved by the belt 48 which receives its motion from the re volving speed pulley 4921 (see Fig. 2) mounted on the shaft 9 said belt being led by suitable pulleys to engage the spindle on which said cutter is mounted to revolve the same very rapidly. One end of said bar 45 is held in a universal joint (not shown) while the other end is supported by the rolls 4.9*49 on thc spindle 50, which spindle is moved vertically by the screw 51, thereby controlling the vertical movement of the bar 45. Said screw 5l receives its motion from the shaft l5 through the belt 52, gears 53, belt 54, pinion 55, gear' 56, worm 57 and worm wheel 58.

In order to automatically regulate the speed of the rotating or reciprocating cutting surface of the die block and attending mechanism to Correspond to the increased cutting surface as the cutter is drawn down from the center, I have arranged to drive the friction disk 13 by the disk l0 through the pair of spring actuated friction plates 11 and 12, which plates are hung on a pin 59 from the lever 60. This lever is pivoted at one end Gl and to its opposite end 62 is connected the continuous flexible cord G3, which cord is led over suitable pulleys above and below said arm. This flexible cord is also connected to and actuated by the movement of the screw nut (i4, which nut also regulates the vertical movement of the pin 50 and bar 45, and by this means the speed of all the different parts are simultaneously regulated to conform to the ever changing position of the cutter and pointer controller bar 45.

When a new piece of work is started in this machine it is found in practice to be necessary, in order to produce the best results, that both the cutting tool 47 and the pointer 46 should be sel. exactly on the center and to get this fine adjustment l have constructed the mechanism best illustrated in Figs. 5 and 6 in which 65 is the collar that holds the cutting tool or the pointer, which collar may be bound to said bar 45 to he firmly held in place, after it is set by the binding sc'rew G6. 67 is a collar fixed to the bar 45. Through ears 68 projecting out from the side of this collar are the set screws 69 which screws engage the end 7() of the said tool supporting collar 65. On the upper side of this collar 67 is shown an elongated hole 71 in which the longitudinal adjusting screw 72 is held to turn and adjust the said tool holding collar longitudinally on the bar 45. By elongating the slot 7l the necessary motion is allowed for the circular adjustment.

My method of reversing the direction of rotation fof the spindles and attending mechanism is extremely simple and practical and is accomplished by electrical means as follows: Around the edge or outline of the pattern or model, see Fig. 3, is bent a thin strip of brass 7 3 or other conducting material supported in any convenient manner, either on posts of insulation, or set into a groove and secured by an insulating cement, as shown in Fig. l. This brass strip is connected through the revolving face plate 4 to the insulated ring 74 on its back side, against which ring rests the conducting finger 75 and by the wire 7 6 is connected to the magnet The second wire 77 connects from the pointer 4G through the battery 7S to the opposite pole of said magnet. By the above construction each time the pointer or tracer travels from one side or edge of the figured surface of the model to the opposite side of edge thereof and comes in contact with the conducting material 73 surrounding said figured surface, the electric circuit is completed, the magnet 33 energized, the core 34 raised and the dog 35 released to allow the shifting bar, which is under tension of the spring arm 7u, to at once throw the clutch 27 out of engagement with one side and into engagement with the other, thereby reversing the direction of rotation of the spindles and attending mechanism. Then the pointer 4G travels back across the face of the figured surface to the opposite side thereof and engages the conducting material on that side when the circuit is again completed and the direction of rotation is again reversed as before, which operation is continued throughout the cutting of the die.

By my improved electric mechanism a quick, positive and automatic reverse is obtained. Both the model and the material under operation may thus be given but a portion of a revolution when desired, the tracer and cutter thereby being caused to travel over the figured surface only.

The operation of my device is further explained as follows: The pattern or model and the die or work to be cut or engraved are mounted on separate parallel spindles 3 and 40 respectively and geared together to rotate in time with each other. Opposite the pattern 5 and piece of material 42 to be operated upon is placed a bar or arm 45 extending longitudinally along the machine, one end of which is furnished with a universal joint (not shown) in order that said bar or arm may be freely moved in vertical and horizontal planes. On this bar or arm is secured the pointer or tracer 46 the end of which is kept in constant contact with the surface of the model 5 as it revolves or reciprocates slowly in front of it, and mounted on the same bar is arapidly revolving cutting tool 47 which comes opposite the die or material to be operated upon, so that as the pointer or tracer follows the uneven surface of the pattern the cutting tool acts correspondingly upon the material under operation, the result being that the die is cut to form an exact facsimile of the pattern, the only difference being its reduced size, every part of the figured surface being in exact proportion to that of the pattern as the movement of the cutter is controlled by the movement of the pointer through the said arm 45 on which both said pointer and cutter are mounted` In setting the machine, the tracer is placed on the pattern at the approximate center of the shortest diameter, whereupon the cutter will start the formation of the die at the same point. As the holder rotates the arm or bar 45 moves in a direction at right angles to the axis of said pattern holder, the result being that the same causes the tracer to traverse a spiral path gradually moving from the center to the outer edge of the pattern. lt will thus be noted that the pattern holder will continue to rotate uninterruptedly until the spiral movement of the tracer ends at the contact strip at which time the machine will reverse, as heretofore pointed out. Frein this time on the position of the tracer will be such that it will pass completely across the pattern each time the machine reverses, whereupon the work and pattern holders are caused to oscillate until the work is completed. ln other words, the work and pattern holders, in the early stage oi the Work are given a rotating movement, and at a later stage an oscillating movement.

Having thus described my invention, what l claim as new and desire to secure by Letters Patent isz" l. A machine oi the character described comprising an oscillating work lioldei, a movable cutter, a pattern, and means for automatically varying the arc through wliicii the work holder moves, said means including members con- .lorniing approximately to the contour ol': the pattern.

2. A machine of the character described comprising an os illating work holder, a movable cutter, a pattern, and means for automatically varying the arc through which the work holder moves with relation to the cutter, said means including' an electrical governing portion having irregular contacts conforming; to the contour ot' the pattern.

3. A machine oi the character described comprising an oscillatingl work holder, a movable cutter, a pattern, and means for automatically varying the arc through which the work holder moves relatively to the cutter, said means including an electrical governing portion having members conforming to the contour of the pattern.

Jr. A machine of the character described comprising,` an oscillating; spindle, a, pattern mounted thereon, an oscilla ing work holder, a cutter, an electrically controlled re versing niechanism. a tracer, and contacts located adjacent the pattern. said reversingl mechanism being in circuit with said contacts and tracer, Wliereby the arc through which the work holder moves with relation to the cutter is automatically varied.

A machine ot the character described comprising an oscillating spindle, a pattern mounted thereon, a tracer, an oscillating spindle to carry the work, a cutter, reversing mechanism. an electro-magnet adapted to control the movement ol the latter, and contacts located adjacent the pattern, said magnet being' in circuit with said contacts' and tra cci', whereby the arc through which the work moves relatively to the cul'ier is automatically varied.

(i, A machine oi? the character described comprising an oscillating spindle, a pattern mounted thereon, a tracer, an oscillating spindle to carry the Work, a cutter, means for oscillating said spindles in unison, reversing mechanism, an electi'oanagnet adapted to control movement thereof, and contacts adjacent the pattern, said magnet being" in circuit with said contacts and tracer, whereby the arc through which the work moves with relation to the cutter is automatically varied.

T. In a machine of the character described, in combina tion, a spindle i'or carrying the pattern, a spindle for carrying the work to be operated upon, means whereby said spindles are driven in, unison. reversing mechanism in chilling a shitting bar` and means for automatically locking it in the desired position, and au elcctroanagnet for coiitrollin, .',l the lock lor said shit 'ng bar.

R. In a machine of the character described, in coinbiiia lion a spindle ior carrying the pattern, a spindle .Ior can rying the work to be operated upon, means whereby said spindles are driven in time with each other, means including a l'riction controlled spring arm for automatically rcvorsing the direction ot' rotation of said spindles and an electro magnet controllingthe movement ot' said spring arm.

il. [n a machine of the character described, in combination. a spindle for carrying the pattern or die, reversing mechanism including,la clutch and a shiftingbar connected to said clutch, a Vfriction controlled spring arm carried on the spindle and acting on said shitting bar, a magnet for controlling the movement ot said shitting bar and means ior energizing said magnet.

1U. ln a machine of the character described, in combination, a spindle l'or carrying the pattern 0r die, a pointer or tracer engaging said pattern reversing mechanism inA cluding a clutch and a shit' ng bar connected to said clutch, a friction controlled spring arm carried on the spindle and acting` on said shitting bar, a. magnet foi-conA trollingl the movement of said shifting bar, and means l'or controlling the action oi` said magnet by the position ot' said pointer or tracer.

l1. A machine ol the character described comprising a rotatable spindle a pattern carried thereby, said pattern beine; provided with oppositely ar'angcd electrical conA tacts conforming to the contour thereof. a pointer or tracer adapted to engage said contacts, and reversing mechanism including an electro-magiict in circuit with said contacts. said reversing mechanism boing adapted to vary the distance through which the work moves with relation to the cutter.

l2. In a machine ot the character described, in combination a spindle for carrying the pattern, a spindle l'or cai'- rying the work to be operated upon, means whereby s' id spindles are driven in time with each other, reversing mechanism to control the direction 4oi' rotation ol.' said spindles, means includingl an electroanagnct ior controllingl said reversingl mechanism, and means including fric tion disks for reducing; the speed ot said spindles as thc cutter is drawn from the center ol the work.

13. ln a machine ot the character described, in combination, :i rotating spindle for carrying the pattern, a pointer or tracer to follow the tace of the said pattern, conducting material on the sides of said pattern, reversing mechanism including an electrofniagnet, means whereby said pointer or tracer is caused to engage said conducting,l material and make the connection to complete the circuit and energize said magnet whereby said reversing mechanism is released to effect a change in the direction ot' rotation ot said spindle, and means for automatically regulatingl the speed of said spindle.

14. A machine of the character described comprising a rotatable spindle a pattern carried thereby, said pattern being; provided with oppositely arranged electrical con tacts conforming to the contour thereof, a spindle tor cai:- rying the work to be operated upon, a pointer or tracer adapted to engage said contacts, and reversing mechanism including an electromagnet in circuit with said contacts said reversing mechanism being adaptedto vai-v the di tance through which the work moves with relation to the cutter` 15. In a machine ot the character described, in combination, a spindle for carrying the pattern, a spindle ior cai'- rying the work to be operated upon, a, pointer or tracer to iollow the face of said pattern, a contact strip carried on said pattern, reversing mechanism a locking mechanism therefor, un electro magnet, and means whereby said pointer or tracer is caused to make the electrical connection with said strip to complete the circuit and energize said magnet and permit the reversingl mechanism to change the direction olf rotation ot? said spindles.

1G. A machine of the character described comprising an approximately horizontal bar, spindles lor carrying' the work and patterns respectively, 'a pointer loosely mounted on said bar, a cutter also loosely mounted on said bar, col4 lars rigidly secured to said bar adjacent said pointer and cut er respectively, and means carried by said collars i'or effecting a combined pivotal and lateral adjustment o1' said pointe and cutter upon said bar.

17. A machine oi' the character described comprising an approximately horizontal bar, spindles Ior carryingl 'the work and pattern respectively, a pointer and a cnlter loosely mounted on said bar and cach provided with a lng, collars rigidly secured to said-bar adjacent said pointer and cutter respectively, set screws carried by said collars and engagingsaid lugs, whereby a pivotal adjustment ol' said cntt and pointer is secured, and adjusting screws carried by said collars and engaging said cutter and pointer respectively, whereby the latter are adjusted laterally.

1S. A machine ot' the character described comprising a pattern holder, means tor rotating the same, and means for automatically changing the rotating movement of said holder to an oscillating movement.

1S). A machine of the character described comprising a pattern holder, means lor rotating' the saine, and means Vfor automatically arising said holder to oscillate at a prcdcA terinined time.

20. A machine oi' the. character described comprising a pattern holder, means Stor rotating the saine, a pattern, a

l contact strip conforming to the contour of the pattern. reversing mechanism in circuit with said contact strip, a tracer also in circuit with said reversing mechanism, and means t'or moving;l said tracer in a direction at right angles to the axis ol said holder. whereby said tracer will engage said contact strip and cause said holder to oscillate.

21. A machine ol the character described comprising' a pattern holder, means l'or rotating,l the same, a pattern, a contact strip contorminy to the contour ot' the pa ttern7 reversing' mechanism in circuiti with said contact strip. a tracer also in circuit: with said reversing;- mechanism,

means for moving.;- said tracer in a direction at right angles to the axis ot' said holder, whereby said tracer will engage said contact strip and cause said holder to oscillate, a work holder, and means for moving said work holder in unison with said pattern holder4 :12. In ar machine of the class described, the combination ot a driving shaft, a reversing mechanism l'or said shaft, a

movable pattern provided with a raised tiange, a tracer, and means intermediate said reversing mechanism and tracer which are controlled by the contact ot the tracer' with the Iiang'e and which operate the shaft-reversing mechanism.

23. In a machine ot the class described, the combina tion ot a driving' shaft, reversing mechanism therefor, a pattern having` a raised surroundingr llange, and a properly mounted tracer, and means intermediate said tracer and shatt reversing' mechanism to operate the latter controlled by the former whenever the tracer passes into contact; with the flange, in alternately opposite directions.

In testimony whereof, I have hereunto sett my hand this 29th day ol.' April A. D. 1904.

CHARLES KUEHNER.

ln presence ot'e Howiucn E. Ihnnow, E. l. OGmiN. 

